Density of gaseous hydrogen

The trailer transport of compressed hydrogen is - because of the low energy density of gaseous hydrogen - only an economic alternative for the distribution of small quantities and short distances (such as during the early phase of hydrogen penetration) and can, therefore, be excluded as an option for the area-wide implementation of a supply infrastructure in a later phase. 

Deviations from the ideal gas law.—The deviation in the density of gaseous hydrogen chloride 1-6392 under normal conditions from the theoretical value 1 6284 (referred to air unity) is because hydrogen chloride is more strongly compressed under atm. press, than corresponds with an ideal gas. R. W. Gray and F. P. Burt7 have measured the pu-values for hydrogen chloride at 0°, and found... 

Figure 11.1. Average H-H distances and volumetric storage densities of gaseous (pressurised) hydrogen, liquid hydrogen and the physical limit of hydrogen in a metal lattice.

PROBLEM 14.1 Hydrogen is used to inflate weather balloons because it is much less dense than air. Calculate the density of gaseous H2 at 25°C and 1 atm pressure. Compare your result with the density of dry air under the same conditions (1.185 X 10-3 g / cm3). 

O2 diffusion through the membrane seems to be limited by the percolation network of the diffusion path, which is not only defined by the amount of water in the membrane, but also by the different chemical structure of the membranes. It is difficult to make comparisons of gaseous diffusion behavior among polymers with different structures because polymer morphology can change drastically without appreciable changes in density, and the presence of water and the hydrogen bonds formed between polymer-water moieties also has major effects on system properties. However, some points can be made from these particular studies. 

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